Sorry I mean I wasn't clear, My senior trader told me that the R/R ratios from 25d to 10d should be about 1.8, but he could not explain how that 1.8 was reached, and I suspect he doesn't know.Can someone explain this to me, and what you mean by arithmetic process?

Hi. Can anyone explain to me how you determine the 25 delta to 10 delta r/r and strangle ratios?ThanksAsif